2023-15: Implement part one

input/2023/day_15/input_test.txt

@@ -0,0 +1 @@
+rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7

src/year_2023/day_15_lens_library/mod.rs

@@ -0,0 +1,25 @@
+pub mod part_one;
+// pub mod part_two;
+// pub mod common;
+
+use crate::utils::solution::Solution;
+use crate::utils::input_reader;
+
+pub struct DaySolution ;
+
+
+impl Solution for DaySolution {
+
+    fn input_path(&self) -> &'static str {
+        "input/2023/day_15/input.txt"
+    }
+
+    fn part_one(&self) -> String {
+        input_reader::read_input_file(self.input_path(), part_one::part_one)
+    }
+
+    fn part_two(&self) -> String {
+        // input_reader::read_input_file(self.input_path(), part_two::part_two)
+        String::from("Not implemented")
+    }
+}

src/year_2023/day_15_lens_library/part_one.rs

@@ -0,0 +1,28 @@
+pub fn part_one(input_lines: Vec<String>) -> String {
+
+    let mut full_line: String = String::new();
+    for line in input_lines {
+        full_line.push_str(&line);
+    }
+
+    let init_sequences = full_line.split(',').collect::<Vec<&str>>();
+    let mut result = 0;
+
+    for seq in init_sequences {
+        result += hash_sequence(seq);
+    }
+
+    result.to_string()
+}
+
+fn hash_sequence(sequence: &str) -> usize {
+    
+    let mut hash = 0;
+    for c in sequence.chars() {
+        hash += c as usize;
+        hash *= 17;
+        hash %= 256;
+    }
+
+    hash
+}

src/year_2023/mod.rs

@@ -12,6 +12,7 @@ pub mod day_11_cosmic_expantion;
 pub mod day_12_hot_springs;
 pub mod day_13_point_of_incidence;
 pub mod day_14_parabolic_reflector_dish;
+pub mod day_15_lens_library;
 
 pub fn run(day: &str) {
     let solution: Box<dyn Solution> = match day {
@@ -27,6 +28,7 @@ pub fn run(day: &str) {
         "12" => Box::new(day_12_hot_springs::DaySolution),
         "13" => Box::new(day_13_point_of_incidence::DaySolution),
         "14" => Box::new(day_14_parabolic_reflector_dish::DaySolution),
+        "15" => Box::new(day_15_lens_library::DaySolution),
         _ => panic!("Invalid day specified"),
     };